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Electrical Machines
Special Machines

Practice questions from Special Machines.

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Q#1 Special Machines GATE EE 2008 (Set 1) MCQ +1 mark -0.33 marks

In a stepper motor, the detent torque means

Minimum of the static torque with the phase winding excited.

Maximum of the static torque with the phase winding excited.

Minimum of the static torque with the phase winding unexcited.

Maximum of the static torque with the phase winding unexcited.

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Q#2 Special Machines GATE EE 2007 (Set 1) MCQ +2 marks -0.66 marks

A three-phase, three-stack, variable reluctance step motor has 20 poles on each rotor and stator stack. The step angle of this step motor is

3°

6°

9°

18°

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Q#3 Special Machines GATE EE 2004 (Set 1) MCQ +1 mark -0.33 marks

For a given stepper motor, the following torque has the highest numerical value.

Detent torque

Pull-in torque

Pull-out torque

Holding torque

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Q#4 Special Machines GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

A rotating electrical machine having its self-inductances of both the stator and the rotor windings, independent of the rotor position will be definitely not develop

Starting torque        

Synchronizing torque

Hysteresis torque

Reluctance torque

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Q#5 Special Machines GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

For a 1.8°, 2-phase bipolar stepper motor, the stepping rate is 100steps/second. The rotational speed of the motor in rpm is

15

30

60

90

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Q#6 Special Machines GATE EE 2003 (Set 1) MCQ +1 mark -0.33 marks

Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choose the right combination among the choices given thereafter

Group I

Group II

P.   Food mixer

1.  Permanent magnet dc motor

Q.  Cassette tape recorder

2.  Single phase induction motor

R.   Domestic water pump

3.  Universal motor

S.   Escalator

4.  Three phase induction motor

5.  DC series motor

6.  Stepper motor

P – 3 Q – 6 R – 4 S – 5

P – 1 Q – 3 R – 2 S – 4

P – 3 Q – 1 R – 2 S – 4

P – 3 Q – 2 R – 1 S – 4

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Q#7 Special Machines GATE EE 2000 (Set 1) MCQ +1 mark -0.33 marks

A 1.8° step, 4-pole stepper motor has a total of 40 teeth on 8 poles of stator. The number of rotor teeth for this motor will be

40

50

100

80

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Q#8 Special Machines GATE EE 1996 (Set 1) MCQ +1 mark -0.33 marks

The torque speed characteristic of a repulsion motor resembles which of the following dc motor characteristic?

Separately excited

Shunt

Series

Compound

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Q#9 Special Machines GATE EE 1996 (Set 1) MCQ +1 mark -0.33 marks

Which type of motor is most suitable for computer printer drive?

Reluctance motor

Hysteresis motor

Shaded pole motor

Stepper motor

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